Swamp

Mortician Beetle

Whenever a player sacrifices a creature, you may put a +1/+1 counter on this creature.

Sidisi's Faithful

Exploit (When this creature enters, you may sacrifice a creature.)
When this creature exploits a creature, return target creature to its owner's hand.

Black Cat

When this creature dies, target opponent discards a card at random.

Vulturous Aven

Flying
Exploit (When this creature enters, you may sacrifice a creature.)
When this creature exploits a creature, you draw two cards and you lose 2 life.

Guildsworn Prowler

Deathtouch
When this creature dies, if it wasn't blocking, draw a card.

Accursed Marauder

When this creature enters, each player sacrifices a nontoken creature of their choice.

Silumgar Scavenger

Flying
Exploit (When this creature enters, you may sacrifice a creature.)
Whenever another creature you control dies, put a +1/+1 counter on this creature. It gains haste until end of turn if it exploited that creature.

Malcator's Watcher

Flying, vigilance
When this creature dies, draw a card.

Island

Rot-Tide Gargantua

Exploit (When this creature enters, you may sacrifice a creature.)
When this creature exploits a creature, each opponent sacrifices a creature of their choice.

Dismal Backwater

This land enters tapped.
When this land enters, you gain 1 life.
{T}: Add {U} or {B}.

Fleshbag Marauder

When this creature enters, each player sacrifices a creature of their choice.

Palace Familiar

Flying
When this creature dies, draw a card.

Murky Sewer

This land enters tapped unless a player has 13 or less life.
{T}: Add {U} or {B}.